TOPS-20 PASCAL Language Manual - Bitsavers

INPUT AND OUTPUT
7.5 THE GET PROCEDURE
The GET procedure reads the next component of a
buffer variable.
file into the file
Fo rma t
where:
GET (file variab1e);
file variable
specifies the file to be read.
Before you use the GET procedure to read one or more file components,
you must have called the RESET procedure to prepare the file for
reading (input). RESET moves the file position to the first component
and assigns its value to the file buffer variable.
As a result of the GET procedure, the file position moves to the next
component of the file. The file buffer variable takes on the value of
that component, for example:
r;: [ ~:) E T (B() 0 k ~:; ) Y
N P ItJ Y' pc: ::" li n 0 k ~:; ,., Y
GET (Buoks);
After execution of the RESET procedure, the file buffer variable
Books A is set to the first component of the file. The assignment
statement assigns this value to the variable Newrec. The GET
proce~ure then assigns the value of the second component to Books A ,
moving the file position to the second component. The next GET
procedure moves the file position to the third component, as shown in
Figure 7-1.
B.,'""'", CT
of File
RESET GET
(BOOKS) (BOOKS)
• • t
I
RESET GET GET
(BOOKS) (BOOKS) (BOOKS)
FigurE~ 7-1: File position After GET
I . . I EOF
MR-S-3117-83
By repeatedly using GET statements, you can read sequentially through
the file.
7-f)